Blue Apatite is a calcium phosphate mineral

Citrine is the November birthstone and has been worn as ornament since ancient times across Greece

and Zambia

A birthstone ring with genuine geological color—wearable every day

Mahogany Obsidian Sphere Size:2"D Blue Apatite is a calciumDeep black broken by veins of rust and siennathis is the volcanic record made round. Mahogany obsidian is volcanic glass: felsic lava cooled so quickly that no crystals had time to form. The mahogany coloration comes from inclusions of iron rich minerals, primarily hematite and magnetite, dispersed through the glassy matrix in irregular streaks and patches. Each sphere carries a different proportion of dark glass to warm iron tones. Mohs hardness